Pneumatic attachment for mortising-machines.



E.- E. HOUGHTON.

PNEUMATIC ATTAGHMENT FOR MORTISING MACHINES.

APPLICATION FILED JULY 7,1908

. Patented July 20. 1909.

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thereto.

ELMER E. HOUGHTON, OF BIRMINGHAM, ALABAMA.

PNEUMATIC ATTAGI-IMENT FOR MORTISING-MAGHINES.

Specification of Letters Patent.

Patented July 20, 1909.

Application filed July 7, 19118. Serial No. 442,294.

tachments for mortising machines, the ob' j ect of the invention being to provide an attachment for mortising machines in the nature of an automatic blower for removing the cuttings of the chisel from the mortise by directing a blast of air at the point of the work, which blast is automatically controlled so as to conserve the air supplied and direct the same to the cutting point only as needed.

The attachment is applicable to any ordinary mortising machine now in use without necessitating any change whatever either in the construction or operation of such machine.

With the above and other objects in view, the nature of which will more fully appear as the description proceeds, the invention consists in the novel construction, combination and arrangement of parts as herein fully described, illustrated and claimed.

In the accompanying drawings z-Figure 1 is a front elevation of a mortising machine showing the improved attachment applied Fig. 2 is a vertical section through the attachment and chisel on an enlarged scale taken in the plane parallel to the front Fig. 3 is also a vertical sec tion taken atright angles to Fig. 2. Fig. 4 is a horizontal section taken in line with the throttle valve. Fig. 5 is a vertical section taken on a line to show the arrangementjof air passages in the chisel carrier.

In Fig. 1 I have shown the ordinary mortising machine in which 1 represents a stand mounted upon a suitable base 2, 3 the chisel carrier, 4 the chisel carried thereby, 5 the guides for the carrier 3, 6 the bed or table upon which the work done at 7 is supported, 8 the treadle and 9 the operating connection between the treadle 8 and bed 6.

In carrying out the present invention, I mount an air compressor 10 of any desired construction adjacent to the mortising machine as shown in Fig. 1, said compressor being preferably, equipped with a compressed air storage pipe 11 from which an air feed pipe 12 leads to the main body of the attachment of this invention.

Referring particularly to Figs. 2, 3 and 4, the chisel 4 is provided with the usual bevel edge 14 and provided for the purpose of this invention with a longitudinal bore or air channel 15 the lower end of which opens out near the bevelof the chiselJ The bevel face 14 of the chisel is corrugated, channeled 0r grooved as shown at 16 to break up the shavings or tips and is also formed with intermediate ribs or barbs 1.7 which loosen the chips or shavings as the chisel is withdrawn from the work thereby giving the compressed air blast a chance to remove the shavings or chips from the mortise. The chisel at its upper end is provided with a tapered shank 18 which fits into a corresponding recess in a socket head 19, the latter being in turn provided with a tapered shank 20 which fits into a correspondingly shaped recess in the chisel carrier 3, above referred to and as clearly shown in Figs. 2 and 3.

The socket head 19 is, provided with a horizontal transverse air passage 21 while the shank of the chisel is provided with a corresponding passage 22 which registers with the passage 21 as clearly shown in Fig. 2. The socket head fits within a sleeve 23 which is divided at one side and provided with oppositely extending flanges 24 which receive clamping bolts 25 secured by nuts 26 and spring washers 27 so that the size of the opening in the sleeve may be adjusted to form an accurate sliding fit for the socket head 19. The sleeve 23 is further provided with oppositely projecting trunnions 28 which are received in recesses 29 in the arms of a fork 30, the latter being provided with a journal or shank 31 which is received in a correspondingly shaped opening 32 in a bracket 33 secured to the stand 1 of the mortising machine as indicated in igs. 3 and 4. One of the trunnions 28 is extended to form a throttle valve casing 34 in which is arranged a throttle valve 35 which is illustrated in Figs. 2 and 4. This valve is adapted to open and close an air inlet passage 36 extending lengthwise through avalve casing and hollow trunnion 28 while mounted in the inner portion of the hollow trunnion 28 is a bushing 37 which forms an outer abutment or stop for a check valve 33 preferably in the form of a ballwhich cooperates with a valve seat 39 immediately adj acent to the space in which the socket heacMQ H1 oves as shown in Figs. 2

and 4. The size of the opening in -the valve seat 39 is such as to allow a ball-valveQS to project a short way into the space which 18 occupied at time's'bylthe socket hea(l"19,v' said socket head 19 having its lower end bev-.. :eled or chamfered' as shown at AO-sothatin the downward movement of the socket head, said bevel face 40 acts to thrust theball valve away from its seat and allow anto --pass into the passage 2:1 and thence enter and pass through'the air channel"-to=the wv'orking point of the chisel.

-- pi e 12 i's fiexible and is connected to the tical bolts 42.

' metrically opposite set screw 43.

The valve 85 is provided with a stem 45 7 around which is disposeda coil-spring lo-one end of which is bent as shown at 47 and inserted in a hole orsocket in the valve: casing r 34-while the opposite end of the spring is-bent as shown at 48-and inserted in a hole or r is attached an operatingchain or.-conn'ection socket in a'co1lar49 fast on the stem-45; the

"tension of said spring being exerted to open the valve 35. Connected" to the-stenr45 is" an operating arm "5'0: to the freeend of which 51 which extends-downward and is attached to the bed or table 6 or connected to. move with-the table so as to 'be-controlledin its" I movements by the rising and falling move :ments of'the'treadle S Withth'e resultthat whenthebed or table 6 is raised to: present:

' the worktothe-action of-the' chise1 4, the

-- throttle valve will be opened byv the: spring .said' schisel is carried having: :an: airpassage 46 to allow air: to passto the chamber con trolledby the ball..va-lve-38. Then asr-the purpose of leading air:to--the bore of the vi chisel descends, thechamferedilower portion 40-thereof displaces the check or valve 38 and allows air to enterthespaces52- in opposite sides of the socket head,?Which spaces communicate with the airpassage 2'1 forthe chisel: The'spaces'52are' preferably divided by a central web'53 which acts on thevalve 38 to hold the same unseatedwhile thev chisel is performing its-work at the lower limit of its movement. By referenceto :Fig: 4, it

through an are of 180 without interfering withthe transmission of the'compressed air through the chisel and the working point thereof.

From the. foregoing description it will be apparent that the" attachment hereinabove:

described is adapted to be applied: to the or-= =d1nary chisel mortising -machinenow in common-use and'that it will operate to de- -liver-compressed air in the form of a blast at theopoint. of;.-operation of the chisel; Any suitable air compressor may be used in connection with the vmortising machine and may, as shown in Fig. 1, be driven from a countershaft .which is bolted to the-maindriven shaft of the mortising machine. It will be *observed-that-the air blast is cut off in the u ward movement of the chisel and it will a so be seen that when the chisel is inits upper-position it isfreie to: 'be.tu1'1ied;=the attachment =not 'interfering in @anyn-way with vtheoriginalconstruction or theoperation of J the i-nortising. machine. lit-will also beseen that thesleev'e 23 isreversely OlfiiIlHOtllQl words-adapted to-be turned end forend so as to receive the' 'flexiblewfeed .pipe .12: from either side.

iFlhe-device: as awhole is :a :greattimeaand labor: saver, .nenabling' :the" work to be performed in approximately one-third; ofv the .time now required it'-being: understood th at more time is required toremove the shavings from the mortisesthan isreq uired to-per:- form. the mortlsing:operation.

Iclaimz- I 1. The combination' iin mortising--.ma

' chine; of an :air compressor, achi'selecarrying head having-an airs. assage therein adapted to] communicatewit the litll" compressor and also with an; 'aiimp'assagei in the-body: of a chisel carried by said head, and means oon- :trolled' bythe-Hrnovement of the .work supporting table op erating automatically to cut on and "01f the ;air'from1 the :aircompressor.

2.. A pneumatic attachment'for mortising machines comprismgtan .aiiwcompressor, a

mortising chisel :having 1 an-:air .p-assage leading? therethrough, a socketwhead"by'which said chisel and provided withaaniaiiwpassage :communicating withithez Li1ipiLSSLg6i ofthe I chisel, a sleeve; through fWlllGll: said socket head moves providedwith :valve chamber, a valve 1 controlling said chamber and 3 ar- :ranged to be unseatedbyethe socket' head, a

flexible conduitleading from the: airy comressorand saidivalvemhambeigaand a fork y which saidsleeve is supported.

4; A pneumatic attachment for 'mortising vmachines comp-rising an: air compressor, a

mortising 1 chisel having an air p'assage leading=th=ereth=rougln a socket head by which the chisel is carried, a sleeve having an openthrottle valve in the rising and falling moveing through which the socket head moves, ment of the Work supporting bed of the morsupporting means for said sleeve, a valve tising machine.

chamber in said sleeve a valve controlling In testimony whereof I affix my signature 5 said chamber and adapted to be unseated by in presence of two Witnesses.

the socket head a throttle valve controlling the air passage leading to the valve chamber, ELMER HOUGHTON' an air conduit extending from the air coml/Vitnesses:

pressor to the throttle valve casing, and C. E. MORGAN,

1o treadle-controlled means for operating said 1 FRED. G. FLOWERS. 

